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From "Bryan Duxbury (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-72) [hbase] 'Normal' operation should not depend on throwing of exceptions (e.g. NotServingRegionException)
Date Mon, 04 Feb 2008 20:57:08 GMT

    [ https://issues.apache.org/jira/browse/HBASE-72?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565522#action_12565522
] 

Bryan Duxbury commented on HBASE-72:
------------------------------------

Can we close this issue? if there was a significant amount of desire to refactor this interaction,
it'd have been done by now. 

> [hbase] 'Normal' operation should not depend on throwing of exceptions (e.g. NotServingRegionException)
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-72
>                 URL: https://issues.apache.org/jira/browse/HBASE-72
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
>            Priority: Trivial
>
> Region server and client logs will have lots of the following when a cluster is being
loaded:
> {code}
> org.apache.hadoop.hbase.NotServingRegionException: hbaserepository,,7144829661993961256
>         at org.apache.hadoop.hbase.HRegionServer.getRegion(HRegionServer.java:1208)
>         at org.apache.hadoop.hbase.HRegionServer.getRegion(HRegionServer.java:1180)
>         at org.apache.hadoop.hbase.HRegionServer.startUpdate(HRegionServer.java:1122)
>         at org.apache.hadoop.hbase.HRegionServer.batchUpdate(HRegionServer.java:985)
>         at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:340)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:566)
> {code}
> The NotServingRegionException exception is thrown when the remote server is no longer
serving the asked-for region (usually because its been split).  The server throws the exception
to provoke the client into making a new interrogation of region locations.
> It would be an improvement if such 'normal' operation was not built atop exceptions.
 For example, commits might return a 'region moved' message.

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